package com.carkeeper.web.filter;

import com.carkeeper.web.service.AuthService;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;
@Component
public class AuthFilter implements GlobalFilter,Ordered {

    @Autowired
    private AuthService authService;


    //TODO
    public static final String LOGIN_URL = "http://localhost:8001/api/oauth/toLogin";


    /**
     * 1）判断当前请求是否为登录请求，是的话，则放行
     2) 判断cookie中是否存在信息, 没有的话，拒绝访问
     3）判断redis中令牌是否存在，没有的话，拒绝访问
     * @param exchange
     * @param chain
     * @return
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.判断当前请求是否为登录请求
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //2判断请求路径中是否包含登录请求
        if(request.getURI().getPath().contains("/api/oauth/login") || !UrlFilter.hasAuthorize(request.getURI().getPath())){
            return chain.filter(exchange);//放行
        }
        //3否则，判断cooki中是否存在信息，没有的话，拒绝访问
        String jti = authService.getJtiFromCookie(request);
        //没有则拒绝访问
        if(StringUtils.isEmpty(jti)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //4.判断redis中令牌是否存在，没有的话，拒绝访问
        String token = authService.getTokenFromRedis(jti);
        if(StringUtils.isEmpty(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //5.校验通过，请求头增强，放行
        request.mutate().header("Authorization","Bearer "+token);
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}

